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Process that Powers the Sun

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Please do problem no.4 of the attached file.

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A detailed explanation is given discussing the process that powers the sun..

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The Sun is powered by nuclear fusion. In this process protons fuse into helium nuclei. This process is explained step by step on this webpage:

http://zebu.uoregon.edu/~soper/Sun/fusionsteps.html

In short, there are four processes involved:

1) Two protons interact via the Weak Interaction to form a deuterium nucleus, a positron and a neutrino.

2) Positrons annihilate when they interact with electrons, giving rise to photons.

3) Protons collide ...

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